If you're thinking of Ipe or a different South American hardwood, you might want to consider Boulevard® structural wood tiles or decking from Tournesol Siteworks. The lumber is typically red oak or ash from Minnesota or Wisconsin, treated at high temperatures in a special kiln. The resulting wood tiles are said to be resistant to rot, decay, and pests, and the material weighs about half that of South American hardwoods.
The wood is also free of arsenic, chrome, and other hazardous metals that can be found in pressure treated wood. I like the look of it, too. It is a natural deep brown color that weathers to gray unless it is sealed, so there are definitely options.
And made in the USA makes it especially appealing.